SmogRank / World / United Kingdom / September 2026

Most polluted cities in United Kingdom, September 2026

5 cities in United Kingdom ranked by their average PM2.5 over the 30 days. Worst: London at 6.7 µg/m³, #1,285 of 2,646 cities in the world. Cleanest: Cambridge at 1.5. A city needs measurements on 70% of the days to be ranked.

← London 6.7 µg/m³ 20 µg/m³0
Every city in United Kingdom ranked for September 2026, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1LondonEngland
    37
  2. 2Birminghamlow-cost sensorsEngland
    22
  3. 3Westburylow-cost sensorsEngland
    16
  4. 3Manchesterlow-cost sensorsEngland
    16
  5. 5Cambridgelow-cost sensorsEngland
    8
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, September 2026 · United Kingdom now

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SmogRank, most polluted cities in United Kingdom, PM2.5, September 2026, smogrank.com/gb/history/2026-09 (accessed 2 Oct 2026).

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